Based on the output you have provided, "linux-hosts-all" will be able to mount the NFS export /vol/volume1 and then they will eventually be able to cd into the subfolders (qtrees), provided that they have enough privileges on the filesystem.
Back to your original question, Data ONTAP processes export entries in sequential order, using only the last export entry in the /etc/exportsfile for a specific file system path. Therefore, you should not add multiple export entries for the same file system path, whether exported or actual, to the /etc/exports file.
For example, if you add the following export entries to the /etc/exports file:
Data ONTAP exports /vol/vol0 to all NFS clients for read-write access.