Question on size information in fx_directory_information_get and fx_directory_next_full_entry_find

In the filex documentation of service `fx_directory_next_full_entry_find ` it says the following: 

> size: If non-null, pointer to the destination for the entry's size in bytes.

Is it correct, that for entries being a directory the size is always zero and not the accumulated size of its content?
The same behaviour is observed for `fx_directory_information_get `

