Submounts are getting unmounted inside apiserver pod

Issue

An LV is mounted on /var and there is another LV mount on /var/lib/origin/audit on the master nodes.

/dev/mapper/xx_vg-lv_var                                  59731884      31679332  24995300     56%  /var
/dev/mapper/openpaas_audit-lv_openpaas_audit     314415108    33040        314382068   1%    /var/lib/origin/openpaas-oscp-audit

When mounted to the apiserver pod, the LV on /var/lib/origin/openpaas-oscp-audit directory gets umounted and also not seen in df -h output.

[user@hostl ~] $ oc rsh master-api-example.com
sh-4.2# df -h
Filesystem                       Size  Used Avail Use% Mounted on
overlay                          300G  9.3G  291G   4% /
tmpfs                             55G     0   55G   0% /dev
tmpfs                             55G     0   55G   0% /sys/fs/cgroup
/dev/mapper/xx_vg-lv_root  7.8G  4.3G  3.2G  58% /etc/pki
/dev/mapper/xx_vg-lv_var    57G   30G   25G  56% /etc/hosts
shm                               64M     0   64M   0% /dev/shm
/dev/mapper/dockervg-dockerlv    300G  9.3G  291G   4% /run/secrets

Anything written in the /var/lib/origin/openpaas-oscp-audit inside the pod is actually written in the /dev/mapper/xx_vg-lv_var LV.
How to have the submount to be mounted inside the apiserver pod without explicitly mounting it via hostpath?