docs: public void mkdir() throws SmbException {
          String path = getUncPath0();
  
          if( path.length() == 1 ) {
              throw new SmbException( "Invalid operation for workgroups, servers, or shares" );
          }
  
          /*
           * Create Directory Request / Response
           */
  
          if( log.level >= 3 )
              log.println( "mkdir: " + path );
  
          send( new SmbComCreateDirectory( path ), blank_resp() );
  
          attrExpiration = sizeExpiration = 0;
      }