It shows the abolute path of a member directory (which
is called branch) in aufs, and its permission.
+What: /sys/fs/aufs/si_<id>/brid0, brid1 ... bridN
+Date: July 2013
+Contact: J. R. Okajima <hooanon05@yahoo.co.jp>
+Description:
+ It shows the id of a member directory (which is called
+ branch) in aufs.
+
What: /sys/fs/aufs/si_<id>/xi_path
Date: March 2009
Contact: J. R. Okajima <hooanon05@yahoo.co.jp>