private void copy(Path source, Path target, ImmutableSet<CopyOption> options, boolean move)
      throws IOException {
    JimfsPath sourcePath = checkPath(source);
    JimfsPath targetPath = checkPath(target);

    FileSystemView sourceView = getDefaultView(sourcePath);
    FileSystemView targetView = getDefaultView(targetPath);
    sourceView.copy(sourcePath, targetView, targetPath, options, move);
  }
Returns the default file system view for the given path.
jimfs/src/main/java/com/google/common/jimfs/JimfsFileSystemProvider.java