i've formated my sd card in btrfs, and maked subvolume, and mount with this script:
mount -o subvol=sdcard,compress /dev/mmcblk1 /data/sdcard/
mount -o subvol=Videos /dev/mmcblk1 /home/nemo/Videos/
mount -o subvol=Desktop /dev/mmcblk1 /home/nemo/Desktop/
mount -o subvol=Documents /dev/mmcblk1 /home/nemo/Documents/
mount -o subvol=Downloads /dev/mmcblk1 /home/nemo/Downloads/
mount -o subvol=Music /dev/mmcblk1 /home/nemo/Music/
mount -o subvol=Pictures /dev/mmcblk1 /home/nemo/Pictures/
mount -o subvol=Public /dev/mmcblk1 /home/nemo/Public/
mount -o subvol=Templates /dev/mmcblk1 /home/nemo/Templates/