/proc/self/root/proc/2/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 9 1 1cpu 4 38 1cpuacct 4 38 1blkio 11 35 1memory 8 51 1devices 3 35 1freezer 6 4 1net_cls 2 1 1perf_event 10 1 1net_prio 2 1 1hugetlb 5 1 1pids 7 35 1