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