Custom single post format template

functions.php

<?php
/**
 * Custom single post format template
 * Reference: https://codex.wordpress.org/Function_Reference/get_post_format
 */
function chr_custom_single_post_format( $template ) {
    if ( is_single() && has_post_format() ) {
        $post_format_template = locate_template( 'single-' . get_post_format() . '.php' );
        if ( $post_format_template ) {
            $template = $post_format_template;
        }
    }
    return $template;
}   
add_filter( 'template_include', 'chr_custom_single_post_format' );