[storage][file_systems] Btrfs with zstd compression

[LukeShortCloud]

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zstd compression levels on Btrfs:

• 1 = Slightly slower than lzo but compresses more.
• 2 = The best performance to speed ratio.
• 3 = The default. This was selected by the Btrfs developers because it provides a large compressed size advantage over lzo.

https://www.reddit.com/r/btrfs/comments/bpphbz/my_benchmarks_of_the_new_zstd_levels_in_51/

• 4 or more is not worth using.

https://www.reddit.com/r/zfs/comments/sxx9p7/a_simple_real_world_zfs_compression_speed_an/