df
Filesystem     1K-blocks      Used Available Use% Mounted on
udev            65919500         0  65919500   0% /dev
tmpfs           13197136     10848  13186288   1% /run
/dev/md1       394860308 363170492  11562328  97% /
tmpfs           65985672         0  65985672   0% /dev/shm
tmpfs               5120         4      5116   1% /run/lock
tmpfs           65985672         0  65985672   0% /sys/fs/cgroup
tmpfs           13197132        16  13197116   1% /run/user/124
tmpfs           13197132        12  13197120   1% /run/user/1000

du -hx | sort -h
*SNIP*
2.9G    ./ZFS/BIG/BSD
2.9G    ./ZFS/BIG/Linux
3.5G    ./usr
4.1G    ./ZFS/Enduro
4.1G    ./ZFS/Enduro/WINDOWS
4.1G    ./ZFS/Enduro/WINDOWS/SQL_DATA
9.4G    ./ZFS/BIG/windows/Desktop
27G     ./ZFS/BIG/windows/WIN_SQL
29G     ./ZFS/BIG/windows/DC01
268G    ./ZFS/BIG/windows/WIN_FS_1
332G    ./ZFS/BIG/windows
337G    ./ZFS/BIG
341G    ./ZFS
347G    .

du -hxd 1 --exclude=usr --exclude=tmp

1.5G    ./var
20K ./media
343M    ./boot
4.0K    ./lib64
4.0K    ./srv
16K ./lost+found
13M ./bin
484K    ./root
1.4G    ./home
1.6G    ./lib
13M ./sbin
15M ./etc
433M    ./opt
8.0K    ./mnt
4.0K    ./cdrom
4.0K    ./snap
5.2G    .