message: [docs] more details on how filters are applied
diff: @@ -78,6 +78,11 @@ The widget also has a checkbox ``Date Filter``, which enables time filtering
  capabilities to your dashboard. After checking the box and refreshing, you'll
  see a ``from`` and a ``to`` dropdown show up.
  +By default, the filtering will be applied to all the slices that are built
  +on top of a datasource that shares the column name that the filter is based
  +on. It's also a requirement for that column to be checked as "filterable"
  +in the column tab of the table editor.
  +
  But what about if you don't want certain widgets to get filtered on your
  dashboard? You can do that by editing your dashboard, and in the form,
  edit the ``JSON Metadata`` field, more specifically the
  