FILTERS Function (DAX)
SQL Server 2012
Returns the values that are directly applied as filters to columnName.
The following example shows how to determine the number of direct filters a column has.
=COUNTROWS(FILTERS(ResellerSales_USD[ProductKey]))
The example above lets you know how many direct filters on ResellerSales_USD[ProductKey] have been applied to the context where the expression is being evaluated.