Can we hide data from the superadmin

hi

when a superuser is logged in to the postgres server ,he has priveledge to access all the databases.

can we hide the structure of some of the databases from the superuser?
like if he gives command to open such a database the postgres may ask for access password again.

as in Oracle Database Vault, organizations can pro-actively safeguard application data stored in the Oracle database from being accessed by privileged database users
kindly assist me if there exists any solution for this problem.

thanks,
tarun sharma
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