Since `dirperm1` requires a more recent aufs patch than many current OS release, we cant remove #783 completely. This documents that docker will apply `dirperm1` automatically for systems that support it Signed-off-by: Daniel, Dao Quang Minh <dqminh89@gmail.com> Upstream-commit: d7bbe2fcb5bf44f2fbcfa472e2a06c83d5d3aca1 Component: engine