class_docstr: Wrap a FileSystem instance as a mutable wrapping.
  The keys of the mapping become files under the given root, and the
  values (which must be bytes) the contents of those files.
  
  Parameters
  ----------
  root: string
      prefix for all the files
  fs: FileSystem instance
  check: bool (=True)
      performs a touch at the location, to check for write access.
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code: def _find(fs, path):
      out = set()
      for path, dirs, files in fs.walk(path):
          out.update(fs.pathsep.join([path, f]) for f in files)
      if fs.isfile(path) and path not in out:
          # walk works on directories, but find should also return [path]
          # when path happens to be a file
          out.add(path)
      return sorted(out)
  
imports: from collections.abc import MutableMapping
  from urllib.parse import urlparse
  from .local import LocalFileSystem
label_desc: Use image node_id 12 for calling the FSMap obj's underlying member method code with example usage: obj._find(fs, path) and returns: sorted