我的根分区已满。如何找到 /dev/md1 上挂载的所有目录?
# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 1.6G 14G 11% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/md1 20G 17G 1.9G 90% /
/dev/md2 421G 13G 387G 4% /home
tmpfs 3.1G 0 3.1G 0% /run/user/0