docs: public static long getFreeSpace(final File pPath) {
          // NOTE: Allow null, to get space in current/system volume
          File path = pPath != null ? pPath : new File(".");
  
          Long space = getSpace16("getFreeSpace", path);
          if (space != null) {
              return space;
          }
  
          return FS.getFreeSpace(path);
      }