Can thumbs in Gallery shortcode link to Post they're used in, not the attachment

Just a disclaimer, I understand the difference between link="file" and link="post".

I would like the thumbnails in the default gallery shortcode to link to the blog post they’re used in rather than the image’s attachment page.

Here’s an example…
http://www.troylaundry.com/portfolio/

And the code is…
[gallery link="post" ids="106,107,133"]

Those 3 images are attached to their own blog posts (Posts > Add New) and are Featured Images respectively (not Insert Into Post). And by “attached” I mean, in the Media > Library panel I have specifically clicked “Attach” and selected the appropriate blog post.

As you can see, they link to what I believe is called the “attachment page” in WordPress-speak. I’d like to have it link to their blog post, not that attachment page.

I feel this can be done because it has the slug to the blog post in the link, but is also appending the slug to the attachment page…

http://www.troylaundry.com/bathroom-of-an-abandoned-mineral-spa-at-the-salton-sea/mineral-spa-bathroom-salton-sea/

But I’d rather it simply link to…
http://www.troylaundry.com/bathroom-of-an-abandoned-mineral-spa-at-the-salton-sea/

I’ve tried NextGen Gallery and WP Gallery Custom Links but would love to achieve this without them if possible.

Many many thanks!