Adding more on -m and --memory (cherry picked from commit c3fbca106552f2dadcb89510ff87945b50f36419) Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit b4047a849bd3018f8a8eabf34613a4fca57f818e) Signed-off-by: Tibor Vass <tibor@docker.com>