Show Attachements

I’m trying to show attached files in the post on the front end. How can I pull the post ID please?

I’m using this code:

<?php // get post attachments
$post_attachments = get_posts( array (
‘post_type’ => ‘attachment’,
‘post_parent’ => $post->ID,

));
?>

<?php foreach ( $post_attachments as $post_attachment ) {
echo ‘
• ‘ . wp_get_attachment_link( $post_attachment->ID, ”, false, false ) . ‘

‘;
} ?>

The code returns all the attachments, not just the ones attached to the post. If I set the post ID I get the correct attachment. What should the post_parent be set to?

Many Thanks.