node exporter is not ignoring a mount point

[david....@dtakers.com]

We are running a node exporter in a docker container v0.15.1 with the following docker-compose.

volumes:

      - /proc:/host/proc:ro
      - /sys:/host/sys:ro
      - /:/rootfs:ro
    command:
      - '--path.procfs=/host/proc'
      - '--path.sysfs=/host/sys'
      - --collector.filesystem.ignored-mount-points
      - "^/(sys|proc|dev|host|etc|rootfs/var/lib/docker/containers|rootfs/var/lib/docker/overlay2|rootfs/run/docker/netns|rootfs/var/lib/docker/aufs|rootfs/opt/docker/devicemapper)($$|/)"

But even the log with debug level is saying 

time="2018-04-18T13:51:09Z" level=debug msg="Ignoring mount point: /rootfs/opt/docker/devicemapper/mnt/5edaab07eea690d26b99f6258322f170441af87111d6ca0312fac519fc0e1a38/rootfs/sys/fs/cgroup/freezer" source="filesystem_linux.go:42"

In /var/log/messages are coming errors like this,

journal: time="2018-04-15T01:28:08Z" level=error msg="Error on statfs() system call for \"/rootfs/opt/docker/devicemapper/mnt/5edaab07eea690d26b99f6258322f170441af87111d6ca0312fac519fc0e1a38/rootfs\": permission denied" source="filesystem_linux.go:57"#015

There is any solution for this?