It is very hard, I would say almost impossible. What you can do is to respond in a professional and confident way (and your audience may appreciate it):
1. If you think you're a victim of negative fake reviews, you can flag the comment(s). Most of the time, it will not changing anything, but you can try. A second step is to contact them directly on X: googlemybiz (here u have more chances to solve the issue).
2. Identifying that the conversation or encounter described in the review could not have occurred with your business provides an opportunity to directly address any potential issues. Additionally, providing your email to the reviewers further demonstrates your commitment to resolving any complaints they have. Never involve in direct conflict with the fake reviewer, trying to prove he/she is wrong. Be smart.
3. For the other reviews, mostly the 5* ones, try to respond to each one and to make the reviewers to engage in the conversation. A liked + commented review will be placed in the top (and the fake reviews will be buried down). Also, your audience will see how do you talk with your clients, and that's another +.
Cheers!
M