remove a Set of keys from a Map

I have (x :: Set key) and (m :: Map key a) and want to remove all keys and corresponding values from m that are in x. I could solve it efficiently with a differenceSet :: Map key a -> Set key -> Map key a or with a Map.fromKeySet :: a -> Set key -> Map key a or a Map.fromKeySet :: (key -> a) -> Set key -> Map key a but I did not find one of these functions in containers-0.4.2.