Check whether or not the file system type of a mountpoint is aufs
by calling statfs() instead of parsing mountinfo. This assumes
that aufs graph driver does not allow aufs as a backing file
system.
Signed-off-by: Tatsushi Inagaki <e29253@jp.ibm.com>
Upstream-commit: e8513675a20e2756e6c2915604605236d1a94d65
Component: engine