Hide users &/or groups to certain users

Currently if somebody wants to share a folder or a file, s/he will potentially be able to find out the name of every user in our NC setup.
I don’t want this to happen.
Is there a way to hide, let’s say Group A and its users from users of Group B ?

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On the admin page you can restrict sharing to users within a group. You can as well disable autocompletion of the user name (but not restrict auto-completion to only users in the same group).