Permission Required to sysaltfiles

Hi

I'm holding sa password of our database server, but now, We need to create a SQLUser Login and need to provide SELECT permission to that user on sys.sysaltfiles.

I executed 'GRANT SELECT ON sys.sysaltfiles TO [sql_user]'  but Still from sql_user login, we can't see any data in sys.sysaltfiles (select query is executing but with no rows).

But when I'm logging in using SA then all the rows of above said  table are getting displayed. Please suggest what are the minimum permission requeird for sql_user to View sys.sysaltfiles

Thanks....

Regards, Avik M.