How to hide/remove the menu filter operators which are not required for the particular column?

                   <div id="Grid"></div>         

<script type="text/javascript">
        $(function () {
            $("#Grid").ejGrid({
                dataSource: window.gridData,
                allowPaging: true,
                allowFiltering: true,
                filterSettings: { filterType: "menu" },
                columns: [
                         { field: "OrderID", isPrimaryKey: true, headerText: "Order ID", width: 90 },
                         { field: "CustomerID", headerText: "Customer ID", width: 90 },
                         { field: "EmployeeID", headerText:"Employee ID", width: 90 },
                         { field: "ShipCity", headerText: "Ship City", width: 90 }               ],
                create: "create",
             });
        });
    </script>

@(Html.EJ().Grid<MVCSampleBrowser.Models.EditableOrder>("Grid")
        .Datasource((IEnumerable<object>)ViewBag.datasource)
        .AllowPaging()
        .AllowFiltering().FilterSettings(filter => filter.FilterType(FilterType.Menu))
        .Columns(col =>
            {
                col.Field("OrderID").HeaderText("OrderID").IsPrimaryKey(true).Width(90).Add();
                col.Field("CustomerID").HeaderText("Customer ID").Width(90).Add();
                col.Field("EmployeeID").HeaderText("EmployeeID").Width(90).Add();
                col.Field("ShipCity").HeaderText("Ship City").Width(90).Add();
             })
        .ClientSideEvents(eve => { eve.Create("create"); })
)

namespace Sample.Controllers
{
    public class GridController : Controller
    {
      public ActionResult GridFeatures()
        {
            var DataSource = new NorthwindDataContext().OrdersViews.ToList();
            ViewBag.datasource = DataSource;
            return View();
        }
    }
}

<ej:Grid ID="Grid" runat="server" AllowPaging="True" AllowFiltering="true">
              <FilterSettings FilterType="Menu"></FilterSettings>
              <Columns>
                   <ej:Column Field="OrderID" HeaderText="Order ID" IsPrimaryKey="true" Width="65"></ej:Column>
                   <ej:Column Field="CustomerID" HeaderText="CustomerID" TextAlign="Left" Width="90" />
                   <ej:Column Field="EmployeeID" HeaderText="EmployeeID" Width="90"></ej:Column>
                   <ej:Column Field="ShipCity" HeaderText="ShipCity" TextAlign="Left" Width="90" />
               </Columns>
              <ClientSideEvents Create="create" />
           </ej:Grid>

<script type="text/javascript">
        function create(args) {
            var grid = $("#Grid").ejGrid("instance");
            this.element.on("mousedown", ".e-gridheader .e-filtericon", function (argument) {
                var target = argument.target;
                
               // ”Grid_stringDlg” – Here “Grid” is Grid control ID and where “_stringDlg” is common name for all the string columns in grid. This id is same for all the string columns so we need to find the corresponding column based on the ej-mappingname of the parent element.
 
                $("#Grid_stringDlg").ejDialog({                   
                    //open event of the filter menu dialog
                    open: function (e) {
                        if ($(target).parent().find(".e-headercelldiv").attr("ej-mappingname") == "CustomerID")
                            $("#" + grid._id + "string_ddinput_popup_wrapper").find("li[value='Equal']").hide();
                        else
                            $("#" + grid._id + "string_ddinput_popup_wrapper").find("li[value='Equal']").show();
                    }
                });
            });
        }
</script>