/proc/4/task/4/root/proc
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 /.
#subsys_name hierarchy num_cgroups enabledcpuset 6 1 1cpu 3 59 1cpuacct 3 59 1blkio 10 56 1memory 8 75 1devices 9 56 1freezer 11 4 1net_cls 5 1 1perf_event 7 1 1net_prio 5 1 1hugetlb 2 1 1pids 4 56 1