Node exporter permission denied on root-disk

[nelsonfassis]

Node exporter daemon can't provide storage information returning permission errors:

time="2017-12-20T21:56:20Z" level=error msg="Error on statfs() system call for "/root-disk/run/docker/netns/029a1d875ff5": permission denied" source="filesystem_linux.go:57"
time="2017-12-20T21:56:20Z" level=error msg="Error on statfs() system call for "/root-disk/var/lib/kubelet/pods/94333d97-d07d-11e7-9cab-00155d008304/volumes/kubernetes.io~secret/flannel-token-mr8tv": permission denied" source="filesystem_linux.go:57"

Execcing into the container, seems like the user Nobody can't read past /root-disk/run/docker.

Some other values as CPU and Memory are passed correctly to Prometheus and Grafana, but not storage.

both root-disk and data-disk are mounted as Read Only.