Well I'm glad we followed Mr. S. Holmes dictum which I'll paraphrase... eliminate the impossible and what remains, even if it seems improbable, must hold.
BTW - you may want to look at mmclone. Personally, I find the doc and terminology confusing, but mmclone was designed to efficiently store copies and near-copies of large (virtual machine) images. Uses copy-on-write strategy, similar to GPFS snapshots, but at a file by file granularity. BBTW - we fixed directories - they can now be huge (up to about 2^30 files) and automagically, efficiently grow and shrink in size. Also small directories can be stored efficiently in the inode. The last major improvement was just a few years ago. Before that they could be huge, but would never shrink.
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