* fhandler.h (dirent_states): Add dirent_nfs_d_ino state and add it to

	* fhandler.h (dirent_states): Add dirent_nfs_d_ino state and add it to
	dirent_info_mask.
	* fhandler_disk_file.cc (fhandler_disk_file::opendir): Set
	dirent_nfs_d_ino flag for NFS shares.  Explain why.
	(fhandler_disk_file::readdir): Use FileNamesInformation instead of
	FileBothDirectoryInformation info class on NFS clients not supporting
	the FileIdBothDirectoryInformation info class.  Use local pointers to
	accommodate different offsets.
	* path.cc (symlink_info::check): Don't test directories for symlinks
	on NFS shares.  Enhance comment.