How to bind mount libunionfs?

Samsung has introduced a feature in its stock ROM that moves content of social media aps (like WhatsApp) to SD card, and then links the two folders. I ran the following command in Termux:

`
$su
#mount | grep -i "whatsapp"

` The following output was returned:

`
libunionfs /mnt/runtime/default/emulated/0/WhatsApp fuse rw,nosuid,nodev,relatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0
libunionfs /storage/emulated/0/WhatsApp fuse rw,nosuid,nodev,relatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0
libunionfs /mnt/runtime/read/emulated/0/WhatsApp fuse rw,nosuid,nodev,relatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0
libunionfs /mnt/runtime/write/emulated/0/WhatsApp fuse rw,nosuid,nodev,relatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0

` I learnt from the net that

libunionfs

is a virtual file system. How did Samsung create bind mounts to this system? Normal

#mount -o bind

didn't work.