How should the filter feature manifest itself in google material design tables

I've checked the material design documentation but there is no clear indicator that I can see to tell me what happens if I click on the .

Here's the icon in situ.

I want to know what the interface behaviour should be. Do we get a drop down of filter terms? Can the user specify the filter value? How does it manifest itself once the user has selected their filter value? Any help is gratefully received. Thanks