COW a file from snapshot

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So I've got a daily snapshot of my /home subvolume.  Due to a fat finger, I've
damaged a rather large file so I'd like to pull if from one of these snapshot
backups.  I don't want to simply copy the file since it's many gigs and cp
- --reflink=always doesn't work (produces the error Invalid cross-device link).
Is there a way to recover that file and benefit from COW?
- -- 
- -=[dave]=-

Entropy isn't what it used to be.
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iF4EAREIAAYFAk7wpKUACgkQXM0u5ajNnCgMUQD/Uf0/HygZ9D8StT9Oc6E3+wM/
MBokh6h1iPN2OslJTxgA/RUzFMM2n0+3ORHwvOraJMBJl1P4JfabT31iuemn/BL2
=2cds
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