What is the container total file size reported with podman ps --size?

[heitorPB]

What exactly is the "total file size" displayed with podman ps --size?

I got this:

$ podman ps -a --size
CONTAINER ID  IMAGE        COMMAND       CREATED STATUS       PORTS           NAMES     SIZE
1b59cf172af4  kafka:3.6.1  /opt/scri...  now     Exited (143) 9092->9092/tcp  kafka0-1  19.9kB (virtual 570MB)