smbfs -- chroot escape

Problem Description
smbfs does not properly sanitize paths containing a backslash
character; in particular the directory name '…' is
interpreted as the parent directory by the SMB/CIFS server,
but smbfs handles it in the same manner as any other
directory.
Impact
When inside a chroot environment which resides on a smbfs
mounted file-system it is possible for an attacker to escape
out of this chroot to any other directory on the smbfs
mounted file-system.
Workaround
Mount the smbfs file-systems which need to be used with
chroot on top, in a way so the chroot directory is exactly on
the mount point and not a sub directory