Smarter --smart-group

[Yeraze]

I see that --smart-group will only show groups if the group does not match the user, but I don't think many systems actually do that anymore. On my mac, everything is in group staff .. Most linux corporate machines I use have my home directory owned by some kind of users group.

Seems like it would be more useful to only show groups if the group is not in the user's available groups. Is there a way to achieve this?