Unless the 'default_permissions' mount option is given,
this method should check if opendir is permitted for this
directory. Optionally opendir may also return an arbitrary
filehandle in the ffi_t structure (fi.fh), which will be
passed to readdir, releasedir and fsyncdir.
Open directory.
Unless the 'default_permissions' mount option is given, this method should check if opendir is permitted for this directory. Optionally opendir may also return an arbitrary filehandle in the ffi_t structure (fi.fh), which will be passed to readdir, releasedir and fsyncdir.