This is coming to Docker. libcontainer is getting support for user namespaces[1] and the Docker engine will have a static configurable root map once the changes

This is coming to Docker. libcontainer is getting support for user namespaces[1] and the Docker engine will have a static configurable root map once the changes land. [1] https://github.com/docker/libcontainer/pull/23 https://github.com/docker/libcontainer/pull/23