It depends on how your mounts are setup, but df
might get you closer to what you need.
edit: This command shows the usage of mounted partitions. If your setup is on its own mount, that will probably get you the you need. If not, you might need to do some deductive work.
I didn’t know that, in this context, “Woz” was short for “Wozniak.” Hopefully he’s enjoying that Apple legacy!