+`pid_ns`:::
+ Inode number of the current process ID namespace (see
+ man:pid_namespaces(7)) in the proc file system.
+
+`time_ns`:::
+ Inode number of the current clock namespace (see
+ man:time_namespaces(7)) in the proc file system.
+
+`user_ns`:::
+ Inode number of the current user namespace (see
+ man:user_namespaces(7)) in the proc file system.
+
+`uts_ns`:::
+ Inode number of the current UTS namespace (see
+ man:uts_namespaces(7)) in the proc file system.
+
+Credential context fields (see man:credentials(7))::
++
+`vuid`:::
+ Virtual real user ID: real user ID as seen from the point of view of
+ the current user namespace (see man:user_namespaces(7)).
+
+`vgid`:::
+ Virtual real group ID: real group ID as seen from the point of view
+ of the current user namespace (see man:user_namespaces(7)).
+
+`veuid`:::
+ Virtual effective user ID: effective user ID as seen from the point
+ of view of the current user namespace (see man:user_namespaces(7)).
+
+`vegid`:::
+ Virtual effective group ID: effective group ID as seen from the
+ point of view of the current user namespace (see
+ man:user_namespaces(7)).
+
+`vsuid`:::
+ Virtual saved set-user ID: saved set-user ID as seen from the point
+ of view of the current user namespace (see man:user_namespaces(7)).
+
+`vsgid`:::
+ Virtual saved set-group ID: saved set-group ID as seen from the
+ point of view of the current user namespace (see
+ man:user_namespaces(7)).