Hello, Today I got a mount failure report from a docker developer about special characters in overlayfs lower/upper path. The root cause is quite straightforward because overlayfs uses colon/comma as seperator of lowerdir layers and module options. However, Colon/Comma characters are valid for directory name on linux so some people(especially container users) hope overlayfs could correctly recognize and handle those directories. Strengthen option parsing seems a right solution for fixing the issue, what do think for this? Thanks, Chengguang Xu
