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Yes, btrfs was a tech-preview, meaning use if you want with no support or future guarantees. It has been officially dropped from future plans now.

• lima 9y ago
  And they're working on adding CoW and deduplication to XFS.
  • ty_a 9y ago
    Wow I didn't know that. Very interesting to hear. Hopefully Docker support is considered as well.
    • lima 9y ago
      overlayfs + XFS works very well, so it's probably not a priority (wild guess)