Hide superadmin user

I'd like to hide the superadmin user from appearing in any members lists or being viewable by any user.

e.g. in buddypress the user that holds superadmin rights is listed as part of the members list, and even with a "stealth name" (i.e. not giving the superadmin user the id: superadmin, I still want to hide the superadmin user, irrespective of the id.

Is there a plugin for this? How could this be achieved?