/proc/4
This explorer reads the filesystem of the server it runs on, so /workspace/user isn't present here. Browsing and the terminal still work against this server's own disk from /.
281 0xd 0x7ffd4a27ec80 0x400 0x26c 0x0 0x8 0x7ffd4a27df00 0x7f9d2dda9ec8