PIDNamespaceLabel returns the text label for a PID namespace, giving not only the details about type (always PID) and ID, but additionally the owner's UID and user name.

ProcessLabel returns the text label for a Process, rendering such information such as not only the PID and process name, but also translating the PID into the process' "own" PID namespace, if it differs from the initial/root PID namespace.

BranchVisitor is an asciitree.Visitor which works on a single branch from an initial/root PID namespace going down to a specific process (sic!).

SingleBranch encodes a single branch from the initial/root PID namespace down to a particular process, with all intermediate PID namespaces and processes along the route.

TreeVisitor is an asciitree.Visitor which works on discovery results and visits them in order to produce a process tree.