The attach_to property accepts a message id. So, if you were replying to a webhook, you can use that message's id as the attach_to property. The clients that support this, will make sure that the notification you send is attached to the message you're responding to.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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