Can an administrator list all permissions for another user?
It's simple to find out what permissions a user has on a particular entity, but is it possible to go the other way? Instead of mapping an entity to users' and groups' permissions regarding that object, can I (the administrator) retrieve a list of all permissions (including lack of permission) for a particular user?
One purpose of this might be in an audit, to ensure that permissions have been configured correctly and that nothing has been overlooked. (Perhaps I forgot to remove some permission on an entity that's outside the scope of what I'm testing. Silly, certainly, but not out of the realms of possibility!)

