Under account permissions I can allow a group of users to see all users, I can allow that group to only see users with the same supervisor as the current user (for example, I can have access to see other people who report to my boss) but I cannot seem to give them access to see users that THEY supervise... Users that report to them.

It would be nice to have an option for "User" for that supervisor. I'm not sure why this isn't an option already, it seems kinda silly to let users see others at their own level, but not their direct reports.