File systems --->
<*/M> Btrfs filesystem support [BTRFS_FS]
[*] Btrfs POSIX Access Control Lists [BTRFS_FS_POSIX_ACL]
[ ] Btrfs will run sanity tests upon loading [BTRFS_FS_RUN_SANITY_TESTS]
[ ] Btrfs debugging support [BTRFS_DEBUG]
[ ] Btrfs assert support [BTRFS_ASSERT]
[ ] Btrfs with the ref verify tool compiled in [BTRFS_FS_REF_VERIFY]