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    // inputLocation is "/path/to/v3.zarr"
    Store store = new FilesystemStore(inputLocation);
    Group firstSeries = Group.open(store.resolve("0"));

    Node[] resolutions = firstSeries.listAsArray();
    for (Node r : resolutions) {
      Array resolutionArray = (Array) r;

      // only read the first chunk
      int[] chunks = resolutionArray.metadata.chunkShape();
      long[] offset = new long[] {0, 0, 0, 0, 0};
      ucar.ma2.Array tile = resolutionArray.read(offset, chunks);

      // test dataset only has uint8 arrays
      ByteBuffer buffer = tile.getDataAsByteBuffer();
      System.out.println("comparing " + buffer.limit() + " bytes against fill value");
      int nonFill = 0;
      for (int i=0; i<buffer.limit(); i++) {
        if (buffer.get(i) != ((Number) resolutionArray.metadata.fillValue).byteValue()) {
          nonFill++;
        }
      }
      // expect this to print a value greater than 0 since none of the chunks are empty
      System.out.println("bytes of non-fill: " + nonFill);
    }