How to fetch a sub-tree with the "trees" API?

[zapster]

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The doc of the Get a Tree API says:

If you need to fetch more items, use the non-recursive method of fetching trees, and fetch one sub-tree at a time.

How can I fetch a sub-tree? It seems like it is not documented.

[zapster]

To answer my own question, the tree property in the response contains entries of type tree for subdirectories:

 {
  "tree": [
    {
      "path": "subdir",
      "mode": "040000",
      "type": "tree",
      "sha": "f484d249c660418515fb01c2b9662073663c242e",
      "url": "https://api.github.com/repos/octocat/Hello-World/git/tree/f484d249c660418515fb01c2b9662073663c242e"
    },

The corresponding url points to the sub-tree.