$ git fetch \
   "https://github.com/christian-monch/metadata-test.git" \
   "refs/datalad/*:refs/datalad/*"
From https://github.com/christian-monch/metadata-test
 * [new ref]         refs/datalad/dataset-tree-version-list -> refs/datalad/dataset-tree-version-list
 * [new ref]         refs/datalad/dataset-uuid-set -> refs/datalad/dataset-uuid-set
 * [new ref]         refs/datalad/object-references-2.0 -> refs/datalad/object-references-2.0