Changes:

• libbtrfs: minor version update to 1.1.0
• libbtrfs: fix default search to top=0 as documented
• libbtrfs: rename async to avoid future python binding problems
• libbtrfs: add support for unprivileged subvolume listing ioctls
• other: lot of typos fixed

Created a partition, copied data on it, shrinked it and checked it. In console and GParted, all fine.