Salesforceのフォルダ自体とメールテンプレートの内容を取得

SELECT
    AccessType,
    CreatedById,
    CreatedDate,
    DeveloperName,
    Id,
    IsReadonly,
    LastModifiedById,
    LastModifiedDate,
    Name,
    NamespacePrefix,
    ParentId,
    SystemModstamp,
    Type
FROM
    Folder

https://developer.salesforce.com/docs/atlas.ja-jp.api.meta/api/sforce_api_objects_folder.htm

select id, Name, Subject, Body, DeveloperName, FolderId, FolderName, IsActive from EmailTemplate