Encapsulate the path in quotes.
Example:
ontap9-tme-8040::*> vserver locks show -vserver DEMO -volume files -path "/files/test folder/test.txt"
Vserver: DEMO
Volume Object Path LIF Protocol Lock Type Client
-------- ------------------------- ----------- --------- ----------- ----------
files /files/test folder/test.txt
data2 cifs share-level 10.193.67.236
Sharelock Mode: read-deny_delete
op-lock 10.193.67.236
Oplock Level: batch
2 entries were displayed.