Github GraphQL to recursively list all files in the directory

I want to use the GraphQL Github API to recursively list all files contained in the directory. Right now my query looks like this:

{
  search(first:1, type: REPOSITORY, query: "language:C") {
    edges {
      node {
        ... on Repository {
          name
          descriptionHTML
          stargazers {
            totalCount
          }
          forks {
            totalCount
          }
          object(expression: "master:") {
            ... on Tree {
              entries {
                name
                type
              }
            }
          }
        }
      }
    }
  }
}

However, this only gives me only the first level of directory contents, in particular some of the resulting objects are again trees. Is there a way to adjust the query, such that it recursively list the contents of tree again?