fs_snapshot_mount: Operation not permitted

[wutaijieing]

snaputil -s orig-fs / /mnt  
fs_snapshot_mount: Operation not permitted

[sclsj]

Try mount_apfs -s orig-fs / /mnt?

[sclsj]

If the mount_apfs works, then it's because you haven't signed snaputil with custom entitlements. See issue 2 for more details. Remember to disable SIP and AMFI.