[Libguestfs] Question about "btrfs send/receive" cmd

Hi, I am considering implement "btrfs send/receive" API in libguestfs. But seems its usual condition is incremental backup which is pretty complicated (see 5.7.1: http://docs.oracle.com/cd/E37670_01/E37355/html/ol_sendrecv_btrfs.html) and not suitable for implementation as I think. So I am considering, does it make sense to implement a simplest form: $ btrfs send -f sent_file subvol $ btrfs receive -f sent_file mountpoint which just backup a subvolume and restore it. Anyone have suggestions? -- Yours Sincerely, Cao Jin