Is there now a way to migrate FS without losing shared COW blocks between subvolumes?

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btrfs send lets you keep COW blocks within a subvolume.
But if I have lots of backups where subvolumes have shared data, and I need
to migrate this to a new filesystem, is there a decent way?

I know I can btrfs device add new drive as raid1, but I'm trying to migrate
off an old filesystem that likely wasn't created well. Is there a way to do
that?
I guess ideally I'd need btrfs send on a volume level, not subvolume level.

Thanks,
Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/  
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