btrfs tools patch for quiet output from send

[Lucas]

Any chance we can get this patch backported to Xenial?

https://github.com/kdave/btrfs-progs/commit/09c052a8b4dcaa96fe5e6c28b12ce24729e827a4

At the moment, people are doing clunky work-arounds to suppress
unwanted "At subvol" messages. E.g. btrbk. I know I'd like to see
output from actual errors only, in my scripts.
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