-* cgroups: figure out if we can somehow communicate in a cleaner way whether a
- systemd instance not running in the cgroup root shall or shall not manage the
- attributes of its top-level cgroup. Currently it assumes it manages all, but
- then might get EPERM due to permission porblems/userns, which is OK, but this
- should be revisited to make clearer and also work if the payload systemd runs
- with full privs and without userns.
-