Only Authored Posts Function Wordpress

post_by_current_author.php

<?php
/* Function to only display posts that are authored by the current user. Use capabilities to limit who is affected by this. Will not change post count list on page which can be confusing. Call using pre_get_posts() action hook
*/ 

function posts_by_current_author($query) {
 global $pagenow;

 if( 'edit.php' != $pagenow || !$query->is_admin )
 return $query;

 if( !current_user_can( 'capability' ) ) {
 global $user_ID;
 $query->set('author', $user_ID );
 }
 return $query;
 }