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How to find data copies btrfs

I have deduplicated my btrfs filesystem with bedup, so now all duplicate files (above a certain size) are "reflink" copies. Is there any way to see, given a filename, what other files are the same ...
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1answer
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Are there any deduplication scripts that use btrfs CoW as dedup?

Looking for deduplication tools on Linux there are plenty, see e.g. this wiki page. Allmost all scripts do either only detection, printing the duplicate file names or removing duplicate files by ...