sam.Rank.inherits_from( rank_name_1, rank_name_2 )
This function will trace down to user, check examples.
-- superadmin
-- admin
-- user
print(sam.Rank.inherits_from("superadmin", "superadmin")) -- true
print(sam.Rank.inherits_from("superadmin", "admin")) -- true
print(sam.Rank.inherits_from("superadmin", "user")) -- true
print(sam.Rank.inherits_from("admin", "superadmin")) -- false
print(sam.Rank.inherits_from("admin", "admin")) -- true
print(sam.Rank.inherits_from("admin", "user")) -- true