Request for new btrfs subvolume subcommand:
clone or fork [-i <qgroupid] <source> [<dest>]<name>
Create a subvolume <name> in <dest>, which is a clone or fork of source.
If <dest> is not given, subvolume <name> will be created in the
current directory.
Options
-i <qgroupid>
Add the newly created subvolume to a qgroup. This option can be
given multiple times.
Would (I think):
* btrfs subvolume create <dest-subvolume>
* cp -ax --reflink=always <source-subvolume>/* <dest-subvolume>/
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