Column Filter Menu With (not visible) Implied Operator

I'm trying to add filters to a few columns on my grid.  I've got the data sources all setup and the filterable: ui working fine.  My issue is that when I click on the filter icon on the menu, all I want to see is the DropDownList and the Filter/Clear buttons.  I don't want to see the drop down with the list of operators - I always want the operator to be "eq".

Here are my latest tries at configuration that still don't work (first is the filterable, second is the columns.filterable)
  filterable: { extra: false, mode: 'menu' }
  filterable: { ui: companyFilter, cell: { operator: 'eq', showOperators: false}}

where companyFilter creates a kendo DropDownList with the dataSource being a variable with the distinct companies

Thanks,
--Ed