How to get the default subvolume?

[Yi Yang <yi.y.yang@xxxxxxxxx>]

Hi,

I know I can set the default subvolume for a btrfs fs using

sudo btrfs subvolume set-default 256 /btrfs/mnt

But after that, how can get the default subvolume name? In my opinion,
btrfs-progs should provide "btrfs subvolume get-default /btrfs/mnm" to get
the default subvolume id and name, I think it is very easy to do this in
btrfs-progs and btrfs kernel space.

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