As a possible workaround, you can attempt to delete those "inner" snapshots first. This worked for me to delete all apt-snapshots:
for i in /@apt-* ; sudo btrfs sub del $i/@ ; sudo btrfs sub del $i
As a possible workaround, you can attempt to delete those "inner" snapshots first. This worked for me to delete all apt-snapshots:
for i in /@apt-* ; sudo btrfs sub del $i/@ ; sudo btrfs sub del $i