Constant FS_ENTRY_LINK_DIR 

pub const FS_ENTRY_LINK_DIR: u8 = _; // 32u8

Set on an FS_ENTRY_SYMLINK whose target is a directory, which the sync enumerates like any other. Clients need it to know the entry is expandable: the type alone cannot distinguish a link to a directory from one to a file, and a non-recursive sync has no children listed yet to infer it from.