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