pg_hba.conf alternative

Hello,

Is there not some other alternative to pg_hba.conf?

I have the problem where the system administrators at our company
obviously have access to the whole filesystem, and our database records
needs to be hidden even from them.

With pg_hba.conf that is not possible, as they just change all the conf
lines to "trust" auth and viola they have access to the database without
passwords.

Is there a more secure alternative to this? The perfect scenario being
to deny everyone include "root" access to a database without a password.

regards,
Quintin Beukes