walk - descend a directory hierarchy
Twalk tag  fid  name 
Rwalk tag  fid  qid 
The walk request looks for the file name in the directory represented by fid.
For the walk to succeed, the file identified by fid must be a directory and the implied user of the request must have permission to search the directory. (See Inferno File Protocol, Styx).
After a successful walk, fid represents the specified file. The qid for the new file is returned with the walk reply message.
A walk of the name "." in the root directory of a server is a no-op.
The chdir system call causes a walk.
One or more walk messages may be generated by any of the following calls, which evaluate file names: bind, create, mount, open, remove, stat, unmount, wstat.
The file name element "." (dot, current directory) is interpreted locally and is not transmitted in walk messages.
bind, chdir, open, remove, stat, and Inferno File Protocol, Styx
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