Are you sure? Synology do a very bespoke BTRFS and backport a lot, even though it's incredibly complex to do so. Their BTRFS is not standard, or rather it's not

Are you sure? Synology do a very bespoke BTRFS and backport a lot, even though it's incredibly complex to do so. Their BTRFS is not standard, or rather it's not the standard version for a given kernel version.