-can also be used to modify the export options of an already exported
-directory.
-.P
-Modifications of the kernel export table used by
-.B nfsd(8)
-take place immediately after parsing the command line and updating the
-.B etab
-file.
-.P
-The default export options are
-.BR sync,ro,root_squash,wdelay .
-.\" -------------------- Unexporting Directories ------------------