MSM in XF can be achieved in the same way as for the content pages. You need to create the folder of the Language copy and then you can create the Language copy of XF for each language folder. You can refer to the document https://docs.adobe.com/content/help/en/experience-manager-64/authoring/authoring/experience-fragment..., in this under the sun-heading "Organizing your Experience Fragments" there is an image that shows the folder organization for MSM. Steps you can follow are:
1. Create a root folder ex: sample
2. Now inside the root folder create sub-folder with Title = English and Name = en
3. Inside root folder create one more sub-folder with Title = French and Name = fr
4. Now create one experience fragment under the folder English ex: test-XF
5. Now select the French folder > Create > Language Copy
6. Now in the "Create Language Copy" console, select the source as "/content/experience-fragments/sample/en/test", then select the Target language as "french" and other configs as desired.
You are done, now this is a Live Copy, and MSM is also achieved.
Note: the folder name has to be the language locale ex: en,fr, etc.