Comment 6 for bug 1694891

The quiet mode is now there!
usage: btrfs send [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>] <subvol> [<subvol>...]

    Send the subvolume(s) to stdout.

    Sends the subvolume(s) specified by <subvol> to stdout.
    By default, this will send the whole subvolume. To do an incremental
    send, use '-p <parent>'. If you want to allow btrfs to clone from
    any additional local snapshots, use '-c <clone-src>' (multiple times
    where applicable). You must not specify clone sources unless you
    guarantee that these snapshots are exactly in the same state on both
    sides, the sender and the receiver. It is allowed to omit the
    '-p <parent>' option when '-c <clone-src>' options are given, in
    which case 'btrfs send' will determine a suitable parent among the
    clone sources itself.

    -e If sending multiple subvols at once, use the new
                     format and omit the end-cmd between the subvols.
    -p <parent> Send an incremental stream from <parent> to
                     <subvol>.
    -c <clone-src> Use this snapshot as a clone source for an
                     incremental send (multiple allowed)
    -f <outfile> Output is normally written to stdout. To write to
                     a file, use this option. An alternative would be to
                     use pipes.
    --no-data send in NO_FILE_DATA mode, Note: the output stream
                     does not contain any file data and thus cannot be used
                     to transfer changes. This mode is faster and useful to
                     show the differences in metadata.
    -v|--verbose enable verbose output to stderr, each occurrence of
                     this option increases verbosity
    -q|--quiet suppress all messages, except errors