Thanks for your reply.
I am not sure how to do that.
My root fs runs on ext4.
Mount shows me:
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=32911264k,nr_inodes=8227816,mode=755)
devpts on...