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