cannot share filter with multiple groups

I wanted to share a filter with multiple groups, but it looks like I can only pick one. Is there an existing improvement request to change this? The documentation leads me to believe it is possible. But when I try, it replaces the previous group with the current one. If you visit the "Global Permissions" page, the description under "Create Shared Filter" says "Ability to share a filter globally or with groups of users. " In fact, it should probably read "Ability to share a filter globally or with a group of users. " if that is indeed the restriction.