Copy file to a new destination.

        Returns JSON Patch with proposed change pointing to new copy.

def copy(self, dst, **kwargs):
        """Copy file to a new destination.

        Returns JSON Patch with proposed change pointing to new copy.
        """
        _fs, filename = opener.parse(self.uri)
        _fs_dst, filename_dst = opener.parse(dst)
        copyfile(_fs, filename, _fs_dst, filename_dst, **kwargs)
        return [{'op': 'replace', 'path': self.pointer, 'value': dst}]