OnePlus6T:/ # df /
df /

OnePlus6T:/ # df
df
Filesystem       1K-blocks    Used Available Use% Mounted on
/dev/block/sda13   2837072 2747708     89364  97% /system_root
tmpfs              2871224     808   2870416   1% /dev
tmpfs              2871224       0   2871224   0% /mnt
/dev/block/dm-0    1015716  811880    203836  80% /vendor
tmpfs              2871224    1480   2869744   1% /sbin
none               2871224       0   2871224   0% /sys/fs/cgroup
/dev/block/sda17 113005372 3538536 109466836   4% /data
/dev/block/sde4     122816  120864      1952  99% /vendor/firmware_mnt
/dev/block/sde9      28144   24800      3344  89% /vendor/dsp
/dev/block/sda2      27632    3236     24396  12% /mnt/vendor/persist
/dev/block/sde5      65488     704     64784   2% /vendor/bt_firmware
/dev/block/sde59     95088      64     95024   1% /op1
/dev/block/sda7     237536   12700    224836   6% /op2
/data/media      113005372 3538536 109466836   4% /mnt/runtime/default/emulated

OnePlus6T:/ # df /system
df /system
Filesystem       1K-blocks    Used Available Use% Mounted on
/dev/block/sda13   2837072 2747708     89364  97% /sbin/.magisk/mirror/system