Granular access

Hi there,

I remember there used to be a granular access plugin for elgg 1.8, 1.9.
Since a lot changed under the hood since then, is there anyone who can shed a light on what would be the best approach to achieve this.

I'd like to let my user select one, or maybe more individual users with the userpicker to make an accesscollection to have them + the selected users to have access to the entity an no other users.

Thanks a lot in advance.