/proc/4/root/proc/thread-self
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 /.
11:memory:/10:cpu,cpuacct:/9:hugetlb:/8:freezer:/7:devices:/6:pids:/5:cpuset:/4:net_cls,net_prio:/3:perf_event:/2:blkio:/1:name=systemd:/