code: def test_get_filesystem_s3(shutdown_only):
      root = "bucket/foo/bar"
      with simulate_storage("s3", root) as s3_uri:
          ray.init(storage=s3_uri)
          fs, prefix = storage.get_filesystem()
          assert path_eq(prefix, root), prefix
          assert isinstance(fs, pyarrow.fs.S3FileSystem), fs
  
imports: import os
  import sys
  import subprocess
  import urllib
  from pathlib import Path
  from packaging.version import parse
  import pyarrow.fs
  import pytest
  import ray
  import ray._private.storage
  from ray._private.test_utils import simulate_storage
  from ray._private.utils import _add_creatable_buckets_param_if_s3_uri, _get_pyarrow_version
  from ray.tests.conftest import *
label_desc: Use image node_id 6 for calling a global function with example usage: test_get_filesystem_s3(shutdown_only) without return types