struct dentry * ntfs_get_parent (struct dentry * child_dent);
Find the dentry for the parent directory of the directory specified by the dentry child_dent. This function is called from fs/exportfs/expfs.c::find_exported_dentry which in turn is called from the default ->decode_fh which is export_decode_fh in the same file.
The code is based on the ext3 ->get_parent implementation found in fs/ext3/namei.c::ext3_get_parent.
ntfs_get_parent is called with child_dent->d_inode->i_sem down.
Return the dentry of the parent directory on success or the error code on error (IS_ERR is true).