Test: -fstype type
True if the file is on a filesystem of type type.
The valid filesystem types vary among different versions of Unix;
an incomplete list of filesystem types that are accepted on some version of Unix or another is:
autofs ext3 ext4 fuse.sshfs nfs proc sshfs sysfs ufs tmpfs xfs
You can use ‘-printf’ with the ‘%F’ directive to see the types of your filesystems.
The ‘%D’ directive shows the device number.
refer: https://www.gnu.org/software/findutils/manual/html_node/find_html/Filesystems.html