customize cgroup doesn't work.

I've already create a cgroup for controling my own application.
I run this func in my code for the new customize cgroup :
mount("cgp", "/var/run/cgp", "cgroup",MS_MGC_VAL, "none,name=cgp")
my customize cgroup mount success.
but when I create a new container and start it, bash got error as blow:
Error: failed to run container 576e4d: {"message":"failed to create container(XXX) on containerd: failed to create task for container(XXX): OCI runtime create failed: container_linux.go:355: starting container process caused "process_linux.go:424: container init caused \"rootfs_linux.go:66: mounting \\\"cgroup\\\" to rootfs \\\"rootfs\\\" at \\\"/sys/fs/cgroup\\\" caused \\\"no such file or directory\\\"\"": unknown"}

in rootfs_linux.go:984(func mountNewCgroup),I found the code does consider customize cgroup except “systemd”.

Start at rootfs_linux.go:984, in mountNewCgroup, and trace the cgroup mount path involved in the reported rootfs_linux.go:66 failure. Reproduce the custom cgroup setup described in the issue and document or test the expected behavior: a container should start without the reported “no such file or directory” error.