Bug#1119643: Default name for root subvolume on BTRFS partitions

[João]

Hello, let me just say that there are many tools, and I don't know most.

I'd say that the two most popular tools are Timeshift and Snapper. Timeshift is 
strict with the layout (requires @, @home, etc.). Snapper is configurable and 
doesn't really care. Several other tools are built on top of Snapper. 
apt-btrfs-snapshot is also strict with the layout.